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Thanks Ken,
There is this bit in the manual but, I'm not sure if this would apply if connecting to the zoom without the 1.25" nosepiece:
'Attach the lens unit without the Barlow-adapter (A)
directly onto many 1¼" eyepieces, whenever they do
not already have an integrated barlow element. The
result is a 2x Barlow with very good optical properties'
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